How Old Is Everyone In The Riverside Crew?

In River of Sorrows, everyone is a high school junior. Leon skipped a grade so he's a year younger than everyone else. 

Book 2 happens a year later during the summer. It ends at the beginning of their senior year. Book 3 happens during their entire senior year and possibly a future time skip. 

*Ages are from the end of book 2*

1. Finn: 19 (Birthday is May 24th, 2004) Zodiac- Gemini
2. Rigel: 18 (Birthday is January 17th, 2005) Zodiac- Capricorn
3. Zach: 18 (Birthday is February 9th, 2005) Zodiac- Aquarius
4. Cassandra: 18 (Birthday is March 22nd, 2005) Zodiac- Aries
5. Felix: 18 (Birthday is June 10th, 2005) Zodiac- Gemini
6. Amber: 18 (Birthday is July 20th, 2005) Zodiac- Cancer
7. Lea: 18 (Birthday is July 26th, 2005) Zodiac- Leo
8. Kathleen: 17 (Birthday is September 21st, 2005) Zodiac- Virgo
9. Aaron: 17 (Birthday is October 16th, 2005) Zodiac- Libra
10. Henry: 17 (Birthday is October 25th, 2005) Zodiac- Scorpio
11. Raelyn: 17 (Birthday is November 14th, 2005) Zodiac- Scorpio
12. Bethany: 17 (Birthday is December 12th, 2005) Zodiac- Sagittarius 
13. Leon: 17 (Birthday is June 24th, 2006) Zodiac- Cancer
14. Alice: 7 (Birthday is December 23rd, 2015) Zodiac- Capricorn (She's a new character related to someone here)